I've read A LOT of posts on here about wheel/tire size and can't really find the answer I'm looking for. I know it obviously depends on what you're doing with the car which size is best, but I'm wanting to know how much difference the diameter makes in overall performance. For all around best handling, riding, etc, which size is "best"? Or is there not that big of a difference?
Mine came with 19s. I want new wheels and tires and don't know if I should stick with the 19s for some reason and their limited tire availability or switch to 20s? Or would 18s be better for some reason? Mine is just a daily driver that I drive fairly aggressively most of the time. Especially for a v6!!! LOL!!!
Is there any benefit to the 20s except tire/wheel choices? Are there any negatives for the 20s over 19 or 18? Sorry if this sounds stupid. I'm just not sure myself and figure you guys are the best to ask!!!

Oh...and just cruising around town or on a highway, I absolutely LOVE the way it drives now with the stock 19" rims and P Zeros!!! LOL!!! So from what I have read from you guys in other posts, I should be happy with about ANYTHING else compared to those! LOL!!!

Mine is a 1LT if that makes a difference. In WHEEL SIZE not performance!!! LOL

Oh...and just cruising around town or on a highway, I absolutely LOVE the way it drives now with the stock 19" rims and P Zeros!!! LOL!!! So from what I have read from you guys in other posts, I should be happy with about ANYTHING else compared to those! LOL!!!

Mine is a 1LT if that makes a difference. In WHEEL SIZE not performance!!! LOL

Well your Pirellis are a different model than the ones that come on the SS and v6's with the RS package that most people (myself included) don't like

I didn't know mine were different. You mean the summer only tires are the junk ones? Mine are the all-season I know but need replaced, When I got the car they had maybe 65% of their thread left. They were NOT good in the snow like they were, and even now, if someone spits on the road in front of me and I give it any gas, it spins! LOL
And it's REAL fun when there is a very light dew still on the road that hasn't evaporated yet and you punch it at 60 mph and the car breaks loose and goes sideways for a brief couple of seconds!!! Sure wakes you up and it may be awhile before you "un-pucker" if you know what I mean!!! LOL!!!

Yes I agree with that. I wouldn't want anything larger. Like I said, I'm not sure I want the 20s except that there are so many wheel and tire options with that size. A lot of 18s also. Just wasn't sure if one is better than the other at all

I am planning on putting winter tires on the stock 19s and getting a new set of wheels/tires for the summer. Just want to know if I'm compromising or gaining anything with 18s or 20s? Or does it make no noticeable difference at all?

Tim it sounds to me by the way you drive you need to stick with the stock option tire and rims..you could go with a 20 inch wheel that would look sweet but you need to find a lighter rim combinations ,anything over stock weight of tires or rims you will notice in your v-6, i did...... i have the 20 inch rims with bigger tires and i really like it but i dont drive aggressive ....... if you really enjoy the hop and tire spin in your v-6 go light and small....i went custom 20s with 275/40 in front and 295/40/ in the back and really like the look .......

Are you looking to rotate the tires too. Which case go with 275/40/20' in all 4 corners. Better handling, good looks. I had the 19's on mine and wanted something else from day one. Waited until most of the 19 tires were used up. I went with the TSW Nurburgrings for looks and less weight. I get more compliments than I can count. Good luck. It becomes a personal choice.

Also remember when changing tire sizes it can affect your read out on the speedometer. I drive a ss and have seen a lot of options for my wheels size for tire where as if I had a zl1 rims and wanted to change tires I would have to get like a choice of two brands on tirerack.com. What matters the most is safety, and of course comfort and looks. I get complements on my wheels, many do not with their choices. Modern looking wheels are just that.....a dime a dozen and factory looking and usually way too busy. Frankly I like the pzeros but can tell they will wear out too soon and am going to go to a same aaa grip tire with a twice as long wear rating of 440.....as the pzeros are only 220, and the tires will be all seasons.

I've read A LOT of posts on here about wheel/tire size and can't really find the answer I'm looking for. I know it obviously depends on what you're doing with the car which size is best, but I'm wanting to know how much difference the diameter makes in overall performance. For all around best handling, riding, etc, which size is "best"? Or is there not that big of a difference?
Mine came with 19s. I want new wheels and tires and don't know if I should stick with the 19s for some reason and their limited tire availability or switch to 20s? Or would 18s be better for some reason? Mine is just a daily driver that I drive fairly aggressively most of the time. Especially for a v6!!! LOL!!!
Is there any benefit to the 20s except tire/wheel choices? Are there any negatives for the 20s over 19 or 18? Sorry if this sounds stupid. I'm just not sure myself and figure you guys are the best to ask!!!

Thanks for your advise!!!
Tim

Your best bet is probably 20's, if only because there are more sizes available that fit your car. 18's have a slight performance advantage, but you'll either have to put up with the appearance of a too-short tire or you'll have to run a tall sidewall tire (think light truck profiles here). Or lower the car the better part of an inch more than you'd otherwise prefer.

If you aren't going to get into suspension mods or open-tracking, I'll suggest 275/40's on 20 x 10 wheels all around. Decent tires are available in this size, if maybe not quite "top-shelf".

If you can financially stretch a little, more serious tires that would better support any suspension mods you might do would be Michelin Pilot Super Sport, BFG's new Rival tire, or the Goodyear Eagle Supercar G2 tires - all in 285/35-20, on 10" (or 10"/11" a la 1LE) wide rims. Hankook also has this size.

With 320-ish HP, I wouldn't look at tires any bigger either in diameter or width.I'm in a very similar situation HP-wise, if with somewhat more torque - and I'm also looking into the 18" versions of exactly these tires, widths and similar profiles (plus a couple others that wouldn't apply to your car).

I enjoy my 20's, that's probably your best bet because anything higher you're in donk territory lol, I mean you can go higher, but you need to be careful with how you go about it, because there's definitely some people with 22s that have tastefully done it. I went with the staggered look, 245s in the front and 275s in the rear, can't be happier!